Mechanism for threading pipes rods, etc.



Jan. 4, 1927.

J. A. KATZENMEYER MECHANISM FOR THREADING PIPES, RODS, ETC

Filed Oct. 31, 1923 5 SheetsSheet 1 vv/ TNESSES a. yaw/4M- Mane/V702 1927' J; A. KATZENMEYQR MECHANISM FOR THREADING PIPES, RODS, ETC

Filed Oct. 31, 1923 5 Sheets-Sheet 2 F'IG.Z- 28 INVENTOR WIT/IVESSES Jan. 4, 1927.

J. A. KATZENMEYER MECHANISM FOR THREADING PIPES, RODS, ETC

Fi'led Oct. 31 1925 5 Sheets-Sheet 3 4M (up g0 /3 59 $7KWM.

WITNESSES Jan.

J. A; KATZENMEYER MECHANISM FOR 'THREADING PIPES, RODS, ETC

Filed Oct. 31. 1925 5 Sheets-Sheet 5 FIEQE.

v JAIME/V76? W mm W Patented Jan. 4;. 1927.

UWLHETE JOI-IN KATZENMEYER', OFE'LLTWOOD'GITY, PENNSYLVANIA:

MECHANISIVT FOR THREADING' PIPES, RODS,

Application filed October 1923. Serial: 1110. 67.1;892.

In; the accompanying. drawings forming a part of this specification, Fig-. 1 is. a front.

elevation. of a die-head embodying the im:- provements claimed herein; Fig 2 is a. side. elevation of the-same;.Fig..3 is a sectional. elevation on a plane indicated by the line II1I-TI,. Fig. 1; Fig. 4- is' a. sectional elevation on a plane indicated. by the line I-V-IV, Fig, 3; Fig. 5 i's view on an enlarged scale showing. a cutter conveying head; Fig..6is a. sectional detail view illustrating theshde locking, means; Fig. 7 1s a: viewon an: abnormally large scale-lllustrating, the manner. of mounting the cutter in the'carrsyingr head; Fig. 8 is a detail view illustratingthe.preferred method of forming acutter; Fig. 9- illustrates another methodof: forming the cutter;. Figs. 10 and. 11 are ,side andendelevations of a cutter.

In the practiceof the invention the stand is formed, with a base: 1 adapted to slide along guides towardsand from the rotatablechuck. and with a: vertical portion or die stand 2 carrying the parts hereinafter de-- scribed; The means perferably employed for. shifting, the cutters radially consists of acam plate 3 rotatably supported on a 1101- lowcentral boss l. on the vertical portion of the stand;2 and. is held, inplace by a plate or die: head 5' bolted. to the portion ofv the die stand... As. shown in Figs. 3 and 4. the

cam plateis arranged in. an: annular recess formechbetween the die stand 2. and theplate 5, whichis secured to the die head by bolts- 5: This CZUHLPlELlZG is provided on a portion of its periphery with teeth 6 for engagement with a pinion whereby the cam plate may be oscillated as hereinafter described. This: camrplate'is also provided with a plurality of slots '7 so shaped: that whenlthe plate isrotated', pins 8 projecting into the slots will be moved. radially. The

inner ends-of the pinsengage the slots preferably' through the medium of blocks 9 loosely mounted on the-pins and having a lengtlrgreater than their width and having their. opposite sides curved to correspond with. the curvature of the walls of the slots as shown'in Fig. l. This construction ensureslong bearing surfaces between the blocks and the walls of the slots thereby reducing; the wearingaway of said surfaces to a minimum. The pins 8 project through radial slots 10. in the plate .5 and into. engagement with plates orsectors 12. and13of the heads carrying. the cutters as hereinafter described,

said head'sbeing adapted to slide radially between .spaced if-shaped blocks 11. which are preferably formed'by. radially groving. the face of the plate 5. In order to keep the blocks in alin-ement with. the radial s1ots10 in the'die head incase of. the removal) tion of annular ribs 15. on the'endsl'offthei cutters as shown in Fig.3 and Fig. 7. The opposite ends of the cutters are. engaged by ribs 15 on the setting and adjusting. caps; 16, the caps being drawn towards the-plate: 12by means ofbolts 17. The caps are pro-. videdwith grooves intheir-inner ends. for

thereception of'ribs 18 in the plate 13ofl the heads, and have their outer. end'stoothed'for engagement with worms 19 rotatably mount? ed in bearings 20 on the plate 13' asshown in Figs. 3 and5. The ribs. 18 and thetoothedends of the caps 16 are formedonarcsofl.

circles having their centers coincident with the axes of the bolts 17. The cutter carrying 3 heads are held within: the radial grooves plate 21.

In order to effect the rotation of the] cutters by. the caps 16 whensliifted by the.

worms, means. are. employed. for. effecting a positive engagement of caps with thecut: tors, such for example as a pin 16 onthecaps...

engaging holes in the ends er thecutter. It. will be observed that the. range of move? ment of the caps bythe wormsrislimited and in. order to provide for the adjustment" of the cutters when reducedinoperative length" in. sharpening, a plurality of holes. are. formed in the ends of the cutter. hen: the caps have been turned in adjusting the.

cutters to their limit, the caps are turned} back and then lifted until the pins arewith; drawn from their holes,.and thecutter turn ed on its axis until the pins canbe pushedrinto the next holes of theseries.

As shown in Figsaliand 5,.the-cutter is substantially U shaped and is formed either.

no formedby. the V-shapedblocksll by a face.

thelatter hardened. It will be observed that the ends of the ribs terminate in the planes of the inner walls of the legs or sides of the cutter, and these ends may be maintained in proper cutting condition by grinding away the surfaces of these walls, as indicated in Fig. 11. It is preferred that the grinding should be so effected that the inner two and one-half inches in diameter, the

surfaces of the legs will be in planes tangential or approximately tangential to a circle concentric with the axis of the cutter. By thus grinding back the wall of the tool, such "wall will form, when the tool is set, the desired acute angle to a plane passing through the axis of the tool and the axis of the pipe being threaded as shown in Fig. 1.

By reference to Fig. 5 it will be seen that the inner ends of the cutter supporting plate 12 are so cut away as to form what might well be termed the setting finger 22, the advance edge of this finger or index being ina plane in which the entering ends of the ribs on the cutters should lie under normal the same that planes coincident with the ribs of the cutters will be at an angle to the axis of the pipe to be threaded, such angle being dependent on the pitch of the thread to be out. As for example, if it is desired to cut an eight inch thread on a pipe or red cutter should be so supported that planes coincident with the ribs of the cutters will form angles of approximately two degrees with planes at right angles to tneaxis of the pipe or rod. A convenient construction for attaining the proper angular relation of the cutter consists in slightly inclining the face of the plate "12 as shown in Fig. 7. In a full size working device, the divergence of the inclined face of the plate 12 from a plane at right angles to the axis of the pipe, is too small to be clearly shown, and hence Fig. 7 is drawn to anabnormal scale.

The rotation of the cam plate to shift the cutters is effected by a rotatable member adapted to engage the cam plate, as for example by a pinion 23 mounted in a bearing one end of a shaft 27 passing through the pinion as to rotate with the shaft but free to move longitudinally thereof to engage or be disengaged from thepmion; The'disc is shiftable on the shaft to engage the pinion by any suitable means, such for example as the nut 28 screwing onto the shaft which is provided with an operating handle or lever 29. In operating these devices to set the cutters to operate on a larger size of pipe or rod, the handle or lever is shifted a suitable distance from right to left in Fig. l and thereby the disc 26 being in frictional engagement with the pinion, the cam plate is turned in a direction to move the cutters outward. The nut 28 is then turned to release the disc 26 from engagement with the lie pinion, and the lever turned forward from 7 left to right until the indicating point 0 on the disc registers with an indication point on the pinion corresponding to the diameter of pipe to be threaded, the series of indications on the pinion being spaced apart according to the various sizes of pipes to be threaded.

lever again moved to the right against a suitable stop, thus completing the adjustment of the cutters. To adjust the cutters for threading a smaller pipe the disc is first released from engagement with the pinion and the lever turned from right to left until the index 0 registers with the proper mark in the scale on the pinion. The disc is then caused to engage the pinion and the lever returned to normal position.

it is frequently desired to cut a tapering thread on the pipe or rod, of a length greater than the length of the cutters and'in such case the cutters must be moved progressively outward. In the construct-ionshown herein the handle or lever 29 is connected, after the cutters have been adjusted as above described, to the upper end of a rod 82 which extends down to so engage a slide 3-3 ar- The disc is then caused to engage the pinion by tlghtening the nut 28, and the ranged in a guide box 3 f on the base 10 of connected by a pin 35 carried by the legs formed by slotting the rod, passing through an inclined slot 36 formed in the slide so that by the reciprocation of the latter, the rod will be shiftedlongitudinally. When cutting taper threads, with a machine wherein the head carrying the cutters is moved relative to the chuck, provision is made for holding the slide stationary While the die head advances. In the construction shown, a rod 37 which is fixed to the frame of the threading machine in any suitable manner, passes transversely through a boss 38 carried by the slide 33 and by locking the boss to .the rod, the slide will be held stationary while the die head is reciprocated. A convenient method of locking the boss to the rod and also locking the slide to the die head is shown in Fig. 6. As therein shown, the axial opening is formed through the boss and in the outer portion of the bore or opening is inserted a block 39 slotted for the passage of the rod. A screw 40 provided with an operating handle all passes through the end oi'r' the block into the slot and bears on the rod 37 so that by turning the screw the block will be shifted so that the rod will be gripped between the screw and the end wall of the slot. In order to lock the slide to the die head when cutting non-tapering threads, a shell 42 is inserted in the inner end of the boss and in the shell is arranged a longitudinally movable bolt 43, which is adapted to be forced outward into a hole 44 in the base 1 of the die head by a spring as The bolt is connected to the block 39 by a stem 46. The several locking mechanisms are, in Fig. 6, in positions to hold the slide 33 and permit the boss 38 to slide along the rod 37. When it is desired to cut taper threads, the screw is turned in and as the end of the screw bears on the rod 37, the block 39 will be drawn until the inner end of the slot bears against the rod. This outward movement of the block 39 withdraws the bolt from the engagement with the base of the die head.

I claim herein as my invention:

1. In a mechanism for threading pipes, rods, etc., the combination of a die stand having an annular recess therein, a plate provided with cam slots rotatably arranged in said recess, a: plate or die head provided with radial slots and secured to the die stand and forming a cover for the recess in the latter, a plurality of cutter carrying heads slidably arranged in radial guide ways on said cover plate or die head, pins extending through the radial slots in this cover plate and having their respective ends in engagement with the slots in the cam plate and with the cutter heads, and means for shifting the cam plate.

2. In a mechanism for threading pipes rods, etc., the combination of a die stand plate.

having an annular recess therein, a plate provided with cam slots rotatab'ly arranged in said recess, a cover plate or die head pro vided with radial slots secured to the die stand and forming a cover for the recess, a plurality of cutter carrying heads slidably arranged in radial guide wayson the cover plate, pins extending through the radial slots in the cover plate and having their re spective ends in engagement with the slots in the cover plate and with the cutter heads, the outer ends of the pins engaging the cutter heads and provided at their inner ends with blocks slidably mounted in the slots in the cam plate, saidblocks being provided with lugs engaging the radial slots in the cover plate and means for shitting the cam 3. In a mechanism for threading pipes, rods, etc, the'combination of a die stand having an annular recess therein, a plate provided with cam slots rotatably arranged in said recess, a cover plate or die head provided with radial slots secured to the die stand and forming a cover for the recess, a plurality of cutter carrying heads slidably arranged in radial guide ways on the cover plate, pins extending through the radial slots in the cover plate and having their respective ends in engagement with the slots in the cam plate and with the cutter heads, the outer ends of the pins engaging the cuttcr heads and provided at their inner ends with elongated concavo-convex blocks slidably mounted in the slots in the cam plate, said blocks being provided with lugs engaging the radial slots in the cam plate, and means for shifting the cam plate.

4. In a mechanism for threading pipes, rods, etc-., the combination of a die head, a U-shaped cutter block provided with pe ripheral ribs terminating at the inner surface of the block, a head provided with extension forming a bearing for one end of .the cutter block, cap rotatably mounted'on the head and engaging the upper end of the cutter block and means for rotating the cap to adjust the cutter block.

A mechanism for threading pip-es, rods, 0-,, the combination of a die head, a -shaped cutter block provided with periphal ribs in planes at right angles to the axes of the block and terminating at the inner faces of the blocks, a radially movable head provided with means for so supportingthe cutter block that planes coincident with the ribs on the cutter block will intersect the axis of the article being threaded at angles less than right angles. A cap rotatably mounted on the head and engaging the cutter block and means for rotating the cap to adjust the cutter block.

6. In a mechanism for threading pipes, rods, etc., the combination of a die head, a U-shaped cutter block provided with periphill!) eral ribs in planes at right angles to the axis of the block and terminating at the inner faces oi the block, a head provided with an extension forming a bearing for one end of the cutter block, the bearing surface of such extension beingso inclined that planes coincident with the ribs on the cutter block will when the latter is in operative position, intersect the axis of the article being threaded at angles other than right angles, a cap rotatably mounted on the head and engaging the cutter block, and means for rotating the cap.

7 In a machine for threading pipes, rods, etc., the combination of a die-head,a plurality of cutters adapted to be moved radially of the die head, means for moving the cutters, a rotatable element adapted to shift the cutter operating means, a rotatable shaft having a predetermined arc of rotation and means whereby the shaft may be adj ustably connected to the rotatable element whereby the radial movement of the cutters may be varied.

8. In a machine for threading pipes, rods, etc., the combination of a die head, a plurality of cutters adapted to be moved radially of the die head, means for moving the cutters, a rotatable element adapted to shift the cutter operating means, a shaft having a predetermined arc of rotation, a disc adapted to be rotated by the shaft and means for shifting the disc into and out of engagement with the rotatable element whereby the radial movements of the cutter may be varied.

9. In a machine for threading pipes, rods, etc, the combination of a movable die head, a plurality o'f cutters adapted to be moved radially on the head, a plate rotatably mounted on the head, means interposed between the plate and cutters whereby the latter may be shifted on the rotation of the plate, a rotatable element adaptedto rotate the plate, a rotatable shaft and means whereby the shaft may be adjustably connected to the rotatable element, and means operative by and in accordanc with the movement of the die head for rotating said shaft.

10. In a machine for threading pipes, rods, etc., the combination or a movable die head, a plurality of cutters adapted to be moved radially on the head, a plate rotatably mounted on the head, means interposed between the plate and cutters whereby the latter may be shifted on the rotation of the plate, a rotatable element adapted to rotate the plate, a rotatable shaftand means whereby the shaft may be adjustably connected to the rotatable element, and a slide mounted on the die head and operatively connected to the rotatable shaft, and means for preventing the movement of the slide with the die head.

11. In a machine for threading pipes, rods, etc., the combination of a movable die head, a plurality of cutters adapted to be moved radially on the die, a plate rotatably mounted on the head, means interposed between the cutters and plate whereby the cutters may be shifted on the rotation of the plate, a rod operatively connected to the cutter adjusting plate, a slide carried by the die head, and provided with a cam slot, a pin connected to said rod and extending into the slot in the slide, and means for holding the slide from movement with the head.

12. In a machine for threading pipes, rods, etc., the combination of a movable die head, a plurality of cutters adapted to be moved radially on the die, a plate rotatably mounted on the head, means interposed be tween the cutters and plate whereby the cutters may be shifted on the rotation of the plate, a rod operatively connected to the cutter-adjusting plate, a slide c-arried'by the die head and provided with a cam slot, a pin connected to said rod and extending into the slot in th slide, means for holding the slide from movement with the head, and a stationary bar and means for locking the slide to the bar.

13. In a machine for threading pipes, rods, etc., the combination of a movable die head, a plurality oi cutters adapted to be moved radially on the die, a plate rotatably mounted on the head, means interposed between the cutters and plate whereby the cutters may be shifted on the rotation of the plate, a rod operatively connected tothe cutter adjusting plate, a slide carried by the die head and provided with a cam slot, a pin onnected to said rod and extending into the slot in the slide, and means for holding the slide from movement with the head, and means for locking the slide to the head, a stationary bar and means for simultaneously locking the slide to the bar and releasing the lock between the head and slide.

In testimony whereof, I have hereunto set my hand.

JOHN A. KATZENMEYER. 

